brown

If you really want an offbeat grading system you'll have to make that the first priority/deal-breaker in your search. It's rare.

I was also going to say Evergreen College. You can also design your own major there. But do be warned a degree from there doesn't carry the same weight as a school with grades. If your kid goes there, he'll likely stay there -- it's a beautiful area.

Evergreen college in Olympia Washington has pass fail and is part of the “Colleges that change lives”consortium.

My friend’s child who is GTLD did very well there .

Best wishes for your search

St. John's College in Annapolis only gives A-C and failing. I don't know if their system would work for your DS.

https://www.sjc.edu/annapolis-student-handbook/graduate-institute-academic-policies-and-related-matters/evaluation-academic-performance#:~:text=Pass%2C%20or%20Fail.-,St.,the%20Registrar's%20Office%20upon%20request.

Hampshire, I think

DS is a very binary, black-and-white, thinker, so a college with a binary grading system would suit him well. Thank you !